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We report the discovery of EPIC 201498078b, which was first identified as aplanetary candidate from Kepler K2 photometry of Campaign 14, and whoseplanetary nature and orbital parameters were then confirmed with precisionradial velocities. EPIC 201498078b is half as massive as Saturn ($\rmM_P$=$0.179 \pm 0.021$ $\rm M_J$), and has a radius of $\rm R_P$=$0.840 \pm0.011$ $\rm R_J$, which translates into a bulk density of $ \rm \rho_P$=$0.37\pm 0.05$ g cm$^{-3}$. EPIC 201498078b transits its slightly evolved G-typehost star ($\rm M_{\star}$=$1.105 \pm 0.019$ $\rm M_{\odot}$, $\rm R_P$=$1.669\pm 0.022$ $\rm R_{\odot}$) every $11.63364 \pm 0.00010$ days and presents asignificantly eccentric orbit ($e=0.420 \pm 0.034$). We estimate a relativelyshort circularization timescale of 1.8 Gyr for the planet, but given theadvanced age of the system we expect the planet to be engulfed by its evolvinghost star in $\sim 1$ Gyr before the orbit circularizes. The low density of theplanet coupled to the brightness of the host star ($J=9.4$) makes this systemone of the best candidates known to date in the super-Neptune regime foratmospheric characterization via transmission spectroscopy, and to furtherstudy the transition region between ice and gas giant planets.

EPIC 201498078b: A low density Super Neptune on an eccentric orbit